Diocese of Gaul

The Diocese of Gaul was a regional administrative district of the Roman Empire which was created during Diocletian's reforms during his reign from 293-305 AD. Following the Edict of Milan in 313 AD, the Christian Church was legalized, and it created dioceses in every Roman province; these existed until the late 5th century. Augusta Treverorum (Trier) served as the seat of the diocese.